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EP1621149A1 - Dispositif de déploiement d'une spirale embolique avec une fibre de détachement en forme de U - Google Patents

Dispositif de déploiement d'une spirale embolique avec une fibre de détachement en forme de U Download PDF

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Publication number
EP1621149A1
EP1621149A1 EP05254667A EP05254667A EP1621149A1 EP 1621149 A1 EP1621149 A1 EP 1621149A1 EP 05254667 A EP05254667 A EP 05254667A EP 05254667 A EP05254667 A EP 05254667A EP 1621149 A1 EP1621149 A1 EP 1621149A1
Authority
EP
European Patent Office
Prior art keywords
embolic device
fiber
lumen
pusher member
embolic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05254667A
Other languages
German (de)
English (en)
Other versions
EP1621149B1 (fr
Inventor
William W. Sowers
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Codman and Shurtleff Inc
Original Assignee
Cordis Neurovascular Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cordis Neurovascular Inc filed Critical Cordis Neurovascular Inc
Publication of EP1621149A1 publication Critical patent/EP1621149A1/fr
Application granted granted Critical
Publication of EP1621149B1 publication Critical patent/EP1621149B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/12—Surgical instruments, devices or methods for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels or umbilical cord
    • A61B17/12022—Occluding by internal devices, e.g. balloons or releasable wires
    • A61B17/12131—Occluding by internal devices, e.g. balloons or releasable wires characterised by the type of occluding device
    • A61B17/1214—Coils or wires
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/12—Surgical instruments, devices or methods for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels or umbilical cord
    • A61B17/12022—Occluding by internal devices, e.g. balloons or releasable wires
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/12—Surgical instruments, devices or methods for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels or umbilical cord
    • A61B17/12022—Occluding by internal devices, e.g. balloons or releasable wires
    • A61B2017/1205—Introduction devices
    • A61B2017/12054—Details concerning the detachment of the occluding device from the introduction device

Definitions

  • the present invention relates to a medical device for placing an embolic device such as an embolic coil, at a predetermined site within a vessel, and more particularly relates to a catheter based deployment system for delivering an embolic coil.
  • This device is particularly suited to transport an embolic device, such as an embolic coil, through the tortious vasculature of the human brain and to the predetermined site within the vessel.
  • catheter-based devices examples include US- 5108407, entitled “Method and Apparatus for Placement of an Embolic Coil;” and US- 5122136, entitled “Endovascular Electrolytically Detachable Guidewire Tip for the Electroformation of Thrombus in Arteries, Veins, Aneurysms, Vascular Malformations and Arteriovenous Fistulas.” These patents disclose catheter-based devices designed to deliver embolic coils to a predetermined site within a vessel of the human body in order to treat aneurysms, or alternatively, to occlude a blood vessel at a particular location.
  • Coils which are placed in vessels may take the form of helically wound coils, or alternatively, may take the form of randomly wound coils, coils wound within coils or other such coil configurations. Examples of various coil configurations are disclosed in US-5334210, entitled “Vascular Occlusion Assembly;” and US-5382259, entitled, “Vasoocclusion Coil with Attached Tubular Woven or Braided Fibrous Covering.”
  • Embolic coils are generally formed of a radiopaque metallic material, such as platinum, gold, tungsten, or an alloy of these metals. Often, several coils are placed at a given location to occlude the flow of blood through the vessel or aneurysm by promoting thrombus formation at the particular location.
  • embolic coils have been placed within the distal end of a catheter, such that when the distal end of the catheter is properly positioned, the coil may then be pushed out of the end of the catheter with a pusher member to release the coil at the predetermined site within the vessel.
  • This procedure for placement of the embolic coil is conducted under fluoroscopic visualization, such that the movement of a coil through the vasculature of the body may be monitored, and the coil may be placed in the desired location.
  • Still another coil positioning procedure is that of having a catheter with a socket at the distal end, such that it retains a ball that is bonded to the proximal end of the coil.
  • the ball generally larger in diameter than the outside diameter of the coil, is placed in a socket within the lumen at the distal end of the catheter, and the catheter is then moved into a vessel in order to place the coil at a predetermined location.
  • a pusher wire with a piston at the end thereof is pushed distally from the proximal end of the catheter to push the ball out of the socket, in order to release the coil at the predetermined site.
  • Another procedure for placing an embolic coil at a predetermined site within a vessel is that of using a heat releasable adhesive bond for retaining the coil at the distal end of the catheter.
  • One such system uses laser energy transmitted through a fiber optic cable to apply heat to the adhesive bond in order to release the coil from the distal end of the catheter. Such a procedure is disclosed in aforementioned US-5108407.
  • Still another coil deployment system incorporates an interlocking mechanism with the coil.
  • the interlocking end of the embolic coil couples with a similar interlocking end on a pusher assembly.
  • a control wire extends through the two interlocking ends to secure the coil to the pusher assembly.
  • the pusher assembly and embolic coil are initially disposed within the lumen of a catheter. When the embolic coil is pushed out of the end of the catheter for placement, the control wire is retracted and the coil disengages from the pusher assembly.
  • Such a deployment system is disclosed in US-5925059, entitled, "Detachable Embolic Coil Assembly.”
  • Yet another coil deployment system incorporates an embolic device detachably mounted on the distal portion of a pusher member and held in place with a connector thread or fiber.
  • the fiber passes through a cutter member that may be activated to cut the connector fiber. Once the connector fiber is cut, the embolic device is released.
  • Such a deployment system is disclosed in Published US-A-2002/0165569, and entitled, "Intravascular Device Deployment Mechanism Incorporating Mechanical Detachment.”
  • Still another coil deployment system incorporates an embolic device with a stretch resistant member threrethrough.
  • the distal end of the stretch resistant member is attached to the embolic coil, and the proximal end of the stretch resistant member is detachably mounted on an elongated pusher member to allow for placement and release of the coil within a vessel.
  • the stretch resistant member is detachably mounted on the pusher member through various means, such as adhesive or by a connector fiber adhered to or tied onto the pusher member and is detachable by the application of heat.
  • Such a deployment system is disclosed in Published US-A-2004/0034363, entitled, "Stretch Resistant Therapeutic Device.”
  • Still another coil deployment system incorporates a platinum wire and or tip that is inserted into a vascular cavity.
  • the tip may be elongated and flexible, folded upon itself several times, or may have a branched configuration.
  • the tip may be separated from the wire mechanically or via electrolytic separation.
  • Such a system is disclosed in US-5540680; US-5895385; US-5925037; and US-5976126, all entitled, "Endovascular Electrolytically Detachable Wire and Tip for the Formation of Thrombus in Arteries, Veins, Aneurysms, Vascular Malformations, and Arteriovenous Fistulas.”
  • Still another coil deployment system incorporates a pusher member, having a stiff wavy-shaped wire end segment, coupled to an embolic coil and placed within the lumen of the catheter.
  • the coil is advanced through the catheter until it reaches the predetermined site within the vessel, at which time the pusher member is retracted and the embolic coil is released.
  • a pusher member having a stiff wavy-shaped wire end segment
  • the coil is advanced through the catheter until it reaches the predetermined site within the vessel, at which time the pusher member is retracted and the embolic coil is released.
  • Still another embolic device deployment system includes an elongated flexible pusher member slidably disposed within a lumen of a catheter. An embolic device is retained at the end of the pusher member with a detachment filament. When the embolic device is advanced to the predetermined site within the vessel, the detachment filament is withdrawn releasing the embolic device.
  • a detachment filament is withdrawn releasing the embolic device.
  • the present invention is directed toward a vasooclusive embolic device deployment system for use in placing an embolic device at a predetermined site within a vessel including an elongated flexible catheter and an elongated pusher member slidably disposed within the lumen of the catheter.
  • an embolic device Disposed at the distal end of the pusher member is an embolic device, preferably having a headpiece with an aperture therethrough coupled to its proximal end.
  • the aperture through the embolic device which may take the form of a helically wound embolic coil, is formed by bending one of the helical turns at an angle to the remainder of the turns or by soldering a loop to the proximal end of the embolic device.
  • a detachment fiber includes a U-shaped distal section, preferably constructed from platinum, which is sufficiently stiff to maintain a pre-shaped configuration. When the fiber is pulled proximally, it returns to a generally straight configuration.
  • the detachment fiber extends from a position proximal of the proximal end of the device through the lumen of the catheter and toward the embolic device.
  • the U-shaped distal section engages the aperture through the headpiece of the embolic device, such that when the fiber is pulled proximally the U-shaped distal section straightens to thereby release the embolic device.
  • the pusher member includes a lumen therethrough and the embolic device is slidably disposed within the distal end of the lumen of the pusher member.
  • a projection extends inwardly from a wall of the lumen of the pusher member at a position proximal of the embolic device to prevent the embolic device from sliding proximally into the lumen of the pusher.
  • the detachment fiber extends through the lumen of the pusher member toward the embolic device.
  • the U-shaped distal section engages the embolic device disposed within the lumen of the distal end of the pusher member.
  • a releasable clamp having a lumen extending therethrough is mounted on the proximal end of the pusher member.
  • the detachment fiber extends through the lumen of the clamp, so that upon release of the clamp the detachment fiber may be pulled proximally to release the embolic device.
  • Figure 1 generally illustrates one embodiment of a U-shaped detachment fiber arrangement of an embolic device deployment system 10 of the present invention including an elongated flexible catheter 12 having a lumen 14 therethrough.
  • An elongated flexible pusher member 16 having a proximal end 18, a distal end 20, and preferably having a lumen extending therethrough 22, is slidably disposed within the lumen 14 of the catheter 12.
  • the pusher member 16 is constructed from a nickel titanium shape memory alloy, such as nitinol, but alternatively, may be constructed from any flexible, biocompatible material such as stainless steel, nylon, PTFE, other flexible materials, polymers, or composites.
  • An embolic device 24, having a proximal end 26 and a distal end 28, preferably taking the form of an embolic coil having a plurality of helical turns 30, is disposed within the lumen 22 of the distal end 20 of the pusher member 16.
  • the embolic device 24 has a headpiece 32 coupled to its proximal end 26, the headpiece having an aperture 34 therethrough.
  • the aperture 34 may alternately be constructed by bending one of the plurality of helical turns 30 at an angle to the remaining turns, or by welding an additional loop onto the embolic device 24 at an angle to the plurality of helical turns 30.
  • the embolic device may take the form of embolic filaments, braids, expandable meshes, foams, and stents.
  • projections 36 are mounted on the wall of the lumen 22 of the pusher member 16 at a position proximal of the embolic device 24, to prevent the embolic device from moving proximally.
  • the projections 36 are constructed from platinum and secured with adhesive or, alternately, fused into the wall of the lumen 22 of the pusher member 16.
  • the embolic device 24 is further secured by a detachment fiber 38, having a proximal section 40 and a distal section 42 and preferably constructed from a light gauge metal wire such as platinum, nitinol, or other malleable materials.
  • a releasable clamp 44 preferably taking the form of a Tuohy-Borst connector, having a proximal end 46 and a distal end 48 and a lumen therethrough, is mounted on the proximal end 18 of the pusher member 16 and secures the fiber 38.
  • the proximal section 40 of the detachment fiber 38 extends from a position proximal of the proximal end of the clamp 44 and through the lumen of the clamp. Subsequently, the fiber 38 extends through the lumen 22 of the pusher member 16 from its proximal end 18 toward its distal end 20, and releasably engages the embolic device 24 disposed within the lumen 22 of the distal end 20 of the pusher member 16.
  • the distal section 42 of the detachment fiber 38 which extends through the aperture 34 through the headpiece 32 of the embolic device 24, is pre-shaped into a generally U-shaped configuration 50.
  • the clamp 44 maintains tension on the fiber 38.
  • the clamp 44 may be loosened to allow a proximal force to be applied to the proximal section 40 of the detachment fiber 38, to disengage the fiber 38 from the aperture 34 through the headpiece 32 of the embolic device 24, thus releasing the embolic device at the predetermined site within the vessel.
  • Figures 2a, 2b, and 2c generally illustrate the operation of the embolic device deployment system 10 and demonstrate the U-shaped detachment fiber release mechanism. More particularly, Figure 2a illustrates the distal end of the embolic device deployment system 10 after the pusher member 16 is advanced through the catheter 12, and has reached the predetermined site within the vessel.
  • the detachment fiber 38 extends through the lumen 22 of the pusher member 16 toward the distal end 20. At the distal end 20 of the pusher member 16, the distal section 42 of the detachment fiber 38 extends through the aperture 34 through the headpiece 32 of the embolic device 24 in the U-shaped configuration 50.
  • the U-shaped configuration 50 is formed of a material which exhibits the characteristic of being sufficiently stiff to maintain its pre-shaped, U-shaped configuration until pulled proximally from its proximal section to thereby straighten the U-shaped configuration 50.
  • the portion of the detachment fiber 38 proximal of the U-shaped configuration 50 may be constructed from a variable stiffness material created by tapering the fiber 38 from the proximal section 40 to the distal section 42.
  • Figure 2b illustrates the embolic device deployment system 10 after a proximal force has been applied to the detachment fiber 38, such that the detachment fiber 38 is partially disengaged from the aperture 34 through the headpiece 32 of the embolic device 24.
  • the U-shaped configuration 50 straightens as the proximal force is applied.
  • Figure 2c illustrates the embolic device deployment system 10, as the detachment fiber 38 is pulled further proximally.
  • the U-shaped configuration 50 further deforms and straightens to release the embolic device 24 at the predetermined treatment site within the vessel.
  • the embolic device may be placed at a desired location within a vessel, or within an aneurysm, with the configuration of the device deployment system as shown in Figure 2a. If it is determined that the embolic device is improperly positioned, the embolic device 24 may then be withdrawn from that location and placed at another location, or even removed from the body by first withdrawing the pusher member 16 and the embolic device totally back into the catheter. Once the embolic device has been entirely withdrawn back into the delivery catheter, the catheter may then be moved to a more desirable location and the embolic device may then be released at the new location.

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  • Health & Medical Sciences (AREA)
  • Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Vascular Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Reproductive Health (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)
EP05254667A 2004-07-30 2005-07-27 Dispositif de déploiement d'une spirale embolique avec une fibre de détachement en forme de U Expired - Lifetime EP1621149B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US59290104P 2004-07-30 2004-07-30
US11/188,513 US20060025802A1 (en) 2004-07-30 2005-07-25 Embolic coil delivery system with U-shaped fiber release mechanism

Publications (2)

Publication Number Publication Date
EP1621149A1 true EP1621149A1 (fr) 2006-02-01
EP1621149B1 EP1621149B1 (fr) 2008-02-27

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Application Number Title Priority Date Filing Date
EP05254667A Expired - Lifetime EP1621149B1 (fr) 2004-07-30 2005-07-27 Dispositif de déploiement d'une spirale embolique avec une fibre de détachement en forme de U

Country Status (5)

Country Link
US (1) US20060025802A1 (fr)
EP (1) EP1621149B1 (fr)
JP (1) JP2006051349A (fr)
AT (1) ATE387148T1 (fr)
DE (1) DE602005004960T2 (fr)

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CN116211381B (zh) * 2022-07-29 2023-07-11 杭州亿科医疗科技有限公司 一种弹簧圈解脱装置
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EP1621149B1 (fr) 2008-02-27
US20060025802A1 (en) 2006-02-02
JP2006051349A (ja) 2006-02-23
ATE387148T1 (de) 2008-03-15
DE602005004960T2 (de) 2009-03-19
DE602005004960D1 (de) 2008-04-10

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